In 1932, America suffered greatly during the Great Depression. The President at the time, Herbert Hoover, promised many reforms and improvements that would help everyone get back onto their feet. Those promises were broken as Hoover did little to pull America out of the Depression. As a result, Hoover wasn't really well liked, during and after the depression. When the elections of 1932 came around, Hoover decided to run again, but Americans went and voted for Roosevelt, who actually did something to help during the depression.
Least common multiple (LCM) of 10 and 20 is 20.
The three countries were
Northern and Western Europe and the Great Britain
They didn't have advanced equipment
Small nations small populations
Weakened by trade regulation
The city's golden period was in the 14th century CE when the ruler Mansa Musa built mosques of pounded earth and established universities which gained the city international fame as a centre of Islamic learning.