What was the main cause of the islamic world's hardships during the thirteenth century?
a.
western europeans invading muslim lands
b.
mongol tribes invading muslim lands
c.
dissension between rival factions of islam
d.
famine and diseases introduced from africa

Why was the sixteenth amendment important to woodrow wilson’s efforts to regulate the economy? a) the sixteenth amendment lowered interest rates charged by banks. b) the sixteenth amendment allowed congress to levy an income tax c) the sixteenth amendment lowered tariffs on imported goods d) the sixteenth amendment allowed congress to break up monopolies