What started world war 2?

Explanation:

on September 1st 1939 Hitler invaded Poland from the west; two days later France and Britain declared war on Germany, beginning World War II on September 17, Soviet troops invaded Poland from the east

1. between 1754 and 1763

2. a land bridge between siberia and alaska that was exposed during the most recent ice age when the waters of the bering strait receded.

hope this

i believe the answer would be 1.