How did martyrs spread christianity

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 were two reasons for world war ii? -separation of nationalities -territorial disputes over lost territories -settlement in the previous war suited the monarchs

Summarize how the changes in the u.s ecomony during world war ii affected african-americans and mexican farmworkers