Answer:
A I think is the answer.... ..
The name for this idea is "Domino Effect" - this is a theory that says that if one country falls to Communism the neighboring countries would also fall to Communism, much like pieces of Dominos fall when a neighboring piece fell.
This theory was important in the Foreign politics of the US during the cold war.
By 1957, the NAACP had registered nine black students to attend the previously all-white Little Rock Central High, selected on the criteria of excellent grades and attendance. Called the "Little Rock Nine", they were Ernest Green (b. 1941), Elizabeth Eckford (b. 1941), Jefferson Thomas (1942–2010), Terrence Roberts (b.
Since they control lots of island groups which makes thing hard to border up and defend on all sides... Unlike in Germany which they had 2 fronts and it was easier to have bunkers to defend certain location...
The Old Immigration Wave was a group of people that were actually immigrants themselves whereas The New Immigration Wave can be people who weren't immigrants but there family members were or ancestors.