1. What factors led to World War I?

World War 1's true causes included politics, secret alliances, imperialism, and nationalistic pride. There was however, one single incident, the assassination of Archduke Ferdinand, which began a series of events leading to war.

Explanation: I learned this in my social studies class.

angle a = 40.6°

step-by-step explanation:

for any right angle triangle we know the pythagoras theorem reveals

hypotenuse² = height²+base²

by this formula we will calculate the length of hypotenuse

h² = 6²+7²

⇒ h =√36+49 = √85 = 9.22

now from the given triangle sin a = height/ hypotenuse

                                                sin a = 6/9.22 = 0.651

therefore

so angle a = 40.6°

the second industrial revolution occurred in the u.s. beginning in the and its colonial empire allowed its many technological innovations to spread although the american industrial revolution wouldn't take full effect