-- What allowed for the decrease in the effectiveness of German U-Boats at the beginning of the war in Europe?

hold on ill go look

then its a law the end

b. major john c. frémont led a rebellion called the bear flag revolt.

explanation:

during the bear flag revolt, from june to july 1846, a small group of american settlers in california rebelled against the mexican government and proclaimed california an independent republic. the republic was short-lived because soon after the bear flag was raised, the u.s. military began occupying california, which went on to join the union in 1850. the bear flag became the official state flag in 1911.

answer:

it caused mass african migration, african populations to grow, african empires to topple, and racism against slaves to emerge.