"He became president of the Eureka Springs Improvement ... In 1883, he became president of the Eureka Springs" - Can this be rephrased to avoid having "he became president of the" appear in consecutive sentences?
Why isn't the controversy, impeachment attempts, and senate hearings mentioned in the lead? Especially since the senate hearing is given a very large amount of information in the body?
" Ann (née Clark) Clayton" - Unsure where you're getting "nee Clark". The source doesn't directly say this, so it could have been her original middle name instead of moving here maiden name to that slot; and it's spelled Clarke in the source, as well
"became the city engineer of Leavenworth in 1859" - Body says 1860. I've noticed the sources disagree here (Encylopedia of Arkansas says 1860, Donovan says 1859), so it's probably best to state that sources say either 1859 or 1860
"In May 1861 Clayton was formally mustered into the U.S. Volunteers as a Captain of company E" - captain is not a proper noun here, so it should be lowercase. Company E is a proper noun, so it should be uppercase
It's a fairly minor action, but if you wanted to add a brief summary of Clayton chasing John S. Marmaduke around northeastern Arkansas, there's a JSTOR PDF I linked in the sources at 10th Texas Field Battery when I wrote that article. You can get access to JSTOR through WP:LIBRARY. It wasn't a very big action, though, so its fine if you don't want to add it
" three-pronged confederate attack of the forces of General John S. Marmaduke" - Marmaduke's official rank was Brigadier General. There was a Confederate rank that was just "General", so its best to use the official rank of Brigadier General here. Also, Confederate should be capitalized.
" three-pronged confederate attack of the forces of General John S. Marmaduke" - Where in the source are you getting "three-pronged"? The sources I've read about Pine Bluff indicate that Marmaduke's plan was more two-pronged. His split his forces into two wings which attacked Pine Bluff from different directions. It could have split into three prongs once the fighting bogged down in town, but the attack itself was planned as two prongs, I believe.
"Clayton commanded the cavalry brigade on the right flank of the Union forces and received a commendation for his actions" - Two issues with this. First, this is far too close to the wording in the source. Second, the source actually states commendations, not just one.
Is the John Edwards you quote the same person as John Newman Edwards? If so, wikilink. John Newman Edwards was one of Shelby's staff officers, so I wouldn't be surprised if that were him
" in cotton and acquired sufficient capital to purchase a plantation in Jefferson County where he settled after the war" - This is a little too close to the phrasing in the source for my comfort, see WP:CLOSEPARAPHRASING.
"could take the "ironclad oath" that they had not served in the Confederacy or given aid or comfort to the enemy" - close paraphrasing
Slight rewrite. I don't think it is that egregious. Donovan page 44 states "Due to the scarcity of Democrats who could take the "ironclad oath" that they had neither served in the Confederacy nor given "aid or comfort" to the enemy..." Dwkaminski (talk) 12:15, 21 March 2021 (UTC)[reply]
"Clayton was not a delegate to the constitutional convention but did participate in the Republican state nominating convention which was meeting at the same time. That convention selected Clayton as the Republican gubernatorial nominee and James M. Johnson" - close paraphrasing
" and was responsible for more than 200 murders of former slaves and Republicans" - source doesn't state that these murders were of former slaves and Republicans
removed former slaves and Republicans - bit of triangulation since Moneyhon states KKK attacked African Americans and Republicans. Dwkaminski (talk) 12:35, 21 March 2021 (UTC)[reply]
"On April 1, 1868, the state board of election commissioners announced ratification of the constitution and Clayton's election as Governor of Arkansas" - source doesn't mention ratification or the exact date
"During this time Arkansas Republican Congressman James Hinds was attacked and killed while on his way to a political event and Clayton survived an attempt on his life. Clayton responded aggressively to the emergence of the Klan in Arkansas by declaring martial law in fourteen counties for four months in late 1868 and early 1869. Clayton organized the state militia and placed General Daniel Phillips Upham in charge to help suppress violence throughout the state" - source doesn't mention the four months detail or identify Hinds or Upham by name
Added new reference for Hinds assassination. Added Finley reference for length of martial law. Added new reference (Wintory/encyclopedia of Arkansas) for Daniel Phillips Upham's role in supressing KKK in Arkansas. Dwkaminski (talk) 15:17, 22 March 2021 (UTC)[reply]
" Arkansas completed its first ever free public school system - close paraphrasing. The only difference between this and the source is that we include the word "ever"
"Clayton returned to Little Rock, Arkansas where he practiced law and supported economic development" - close paraphrasing. The only differences between this and the source seem to be that "Arkansas" is added and "general" omitted
"On September 9, 1868, he lost his left hand while hunting outside Little Rock when his rifle discharged" - Unclear who he is, the subject of the previous sentence is his daughters
Whew. That's the first round. Once these are addressed, I'll give it another read-through to check for grammar and to make sure all the close paraphrasing got cleaned up. There are some referencing formatting issues as well, but those aren't as significant as the non-supported information and the close paraphrasing, so I will save looking at those until the second round of comments. Hog FarmTalk03:37, 20 March 2021 (UTC)[reply]
Political Graveyard isn't RS. If there's not a better source for that detail available, I think the GA comprehensiveness can still be met with the dates removed
Be consistent with how you do the Encyclopedia of Arkansas - italics vs nonitalics
References are set up slightly different, but it's not an issue. My bad - not part of the GA criteria. I'm use to reviewing for featured articles, and probably have a tendency to blur the FA criteria into GA reviews sometimes. So you can ignore that comment.
I've made a few minor edits, revert anything you don't agree with.
"William was appointed as the U.S. Attorney for the Western District of Arkansas and served as the chief prosecutor in the court of "hanging judge" Isaac Parker for 14 years" - Can't find this in the source
Donovan page 51 lists 1872 as his start date with the RNC. Page 53 states that he was still contacted for federal patronage positions in Arkansas as late as 1912 but I can't find a source beside political graveyard that lists when he left the RNC. You are saying it is preferable to remove dates than keep them with a less than perfect source? Dwkaminski (talk) 15:40, 25 March 2021 (UTC)[reply]
If we can't source it reliably, we can't source it. I guess my train of thought is that the dates aren't essential for GA (it would be desired in a FA, though), but only using reliable sources is essential. I would recommend dropping it from the infobox, and then adding the 1872 date sourced to Donovan in the text, and add that he was still consulted in 1912 as well. If that's all we can do based on the RS, it's all we can do. Hog FarmTalk15:52, 25 March 2021 (UTC)[reply]