The answer is d. France. The French invaded in Mossi states after
taking over the surrounding territories.
This led to the French control of the region. The last king Wobgo
retired and was awarded a pension by the British. He died in 1904.
"The Truman Doctrine was an American foreign policy whose stated purpose was to counter Soviet geopolitical expansion during the Cold War."
A. Gold rush
Everyone believed California had TONS of gold which turned out to be false.
