Answer: The answer is B
Explanation: This is because when he was scouting he found out about the Rio grande and start mobilizing troops there.
Soviet leader Nikita Khrushchev gave the go-ahead for the construction of the infamous border structure. "d"
The Berlin Blockade was the first major crisis of the Cold War. "c"
In Europe the pope became powerful enough that they were above the law, cannon law became a thing giving ecclesiastical people the right to be tried by other monks instead of a normal court. The power of kings decreased during this time as well. Thus leading to christianity and the pope to being the higher authority. Therefore it influenced other aspects in medieval life.
Some of the reasons that global migrations occurred in the 1750-1900 time period were forced labor, poverty,hope for jobs, work-related things, and for safety.