It’s A obviously the best choice
The best option in terms of the Gentleman’s Agreement of 1907 would be that "<span>The United States would not segregate Japanese immigrants, and Japan would not allow further emigration to the United States," although it had less to do with segregation and more to do with not allowing more Japanese into the US. </span>
Yes, the Mexican American residents of these territories did become U.S. citizens.
At times, it was chaotic because it was so much land to control that the ruler split it into "states", and gave each one to a family member. But, after a while they realized some of the family had more land than others, so they began to fight. The bigger lands conquered the others with their stronger army.
The correct answer is:
After doing the ressearch about Johnson's actions, the one that surely brought a huge impact on reconstrution was that he granted amnesty to former Confederate soldiers.