Hey if your in a lower grade and doesn't now the answer to a high grades quetion then don't answer it

Describe the technology advancements that lead to explorers being able to sail great distances. [[ps: doesn't explain where. i am only speculating it's in europe.

What was the most common destination for african american migrants between 1910 and 1930

By june 1943, the allies had regained control of north america. what was the advantage of controlling this region? what would you describe the axis's situation in europe in 1942? how might the axis have benefited by gaining control of great britain by 1942? the last questions of my quiz 10 points more than normal answer it honestly so i can get a good grade < 3