Answer:
British ocean liner, the sinking of which by a German U-boat on May 7, 1915, contributed indirectly to the entry of the United States into World War I. The Lusitania, which was owned by the Cunard Line, was built to compete for the highly lucrative transatlantic passenger trade.
Explanation:
During the ensuing decades, the abolitionist movement grew in Northern states, and Congress regulated the expansion of slavery as new states were admitted to the Union. Britain banned the importation of African slaves in its colonies in 1807 and abolished slavery in the British Empire in 1833.
Well from the way I see it, if other countries were to get in on the holocaust it would just make it worse becuase then Germany would have to start a war with those countries and it would be a big mess and I’m sure other countries feared that something like that would possibly happen which is why they didn’t act upon it and if they did they would be causing problems for their own country which is what they didn’t need.
It required many unwilling citizens to participate in a war