What was the effect of the german invasion of poland in 1939?

a. it allowed germany to gain control of poland’s superior naval force.
b. it caused great britain and france to declare war on germany.
c. it caused russia to seek a non-aggression treaty with germany.
d. it broke the alliance between poland and the axis powers.

B.It caused Great Britain and France to declare war on Germany.

answer: in october 1962, an american u-2 spy plane secretly photographed nuclear missile sites being built by the soviet union on the island of cuba. president kennedy did not want the soviet union and cuba to know that he had discovered the missiles. he met in secret with his advisors for several days to discuss the problem.

explanation:

first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.