Europeans couldn't travel into the interior of Africa in order to take it over because of the African-ruled trade, couldn't navigate violent rivers, or overpower their strong armies. Disease also held them back.
Answer:
You don't really have any multiple choice, so here's an explanation. The entire reason for early sports was to teach younger generations how to work in a team, so that when they worked in industrial factories and businesses, they had already learned teamwork. Pro sports began to rise in popularity as rivalries between regional areas in the US rose through the progressive era. These rivalries had existed since the antebellum era in America before the civil war. Plus, there weren't many forms of entertainment in the industrial areas, and sports(watching or playing) was a great way to keep individuals off the streets and in a better area. Thus, pro sports popularity rose in the 1900s.
I was thinking it was the nationalization of the Suez Canal by Egyptian leader General Gama l Abdel Nasser in July 1956
