Hungary <span>initially opened its borders, allowing East Germans to head West.
This occurred in 1989 during the month of May when the removal of it's fence connecting Austria was removed, thus causing it to be considered a historic event during the Cold War. </span>
I will assume you mean the Homestead Act of 1862, which was the first and most iconic one. In that case, the requirements were that the homesteader, the one filing the claim, be either the head of the household OR twenty-one years old, they had to live only on the designated land, build a home, improve it, and farm the land for five years, and, finally, they had to be a United States citizen that had never taken up arms against America.
Hitler's rise to power is Germany was contributed to by the fact that most of the world was in a great depression. People didn't have jobs, homes, or even food. People were desperate and lacked confidence in their weak government, so they were willing to let Hitler come in and change the way things were. People liked that Hitler told Germany that the blame was not on them, but the Jews, and that he had a way to make Germany powerful again.
In 1823 U.S. President James Monroe proclaimed the U.S. protector of the Western Hemisphere by forbidding European powers from colonizing additional territories in the Americas. In return, Monroe committed to not interfere in the affairs, conflicts, and extant colonial enterprises of European states.
<span>First Transcontinental Railroad -
</span><span>
Here's a link that should give you all of the information you need about the transcontinental railroad.</span>