Answer is the rise of Imperialism.
Because people wanted to move to the west they could yake control of their future and help them to progress in life
Slave traders violently captured Africans and loaded them onto slave ships, where for months these individuals endured the “Middle Passage”—the crossing of the Atlantic from Africa to the North American colonies or West Indies. Many Africans did not survive the journey.
Germany had formally surrendered on November 11, 1918<span>, and all nations had agreed to stop fighting while the terms of peace were negotiated. On June 28, 1919, Germany and the Allied Nations (including Britain, France, Italy and Russia) signed the Treaty of Versailles, formally ending the war.</span>