The Hutu rebel against the Belgians
The theory is Social Darwinism. It is a theory that people, gatherings, and people groups are liable to indistinguishable Darwinian laws of regular determination from plants and creatures. Presently to a great extent ruined, social Darwinism was pushed by Herbert Spencer and others in the late nineteenth and mid-twentieth hundreds of years and was utilized to legitimize political conservatism, dominion, and bigotry and to dishearten mediation and change.
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The US was pulled into the war after the sinking of the Lusitania by German U-boats.
The arrival of the Americans lifted the long standing stalemate of the western front, and allowed America to have a big role on the affairs of the peace deal.
The Zimmerman Telegram was a telegram to mexico to invade US territory.