Segregation, Jim crow, and racism. But the main answer is segregation.
the immediate cause of the rebellion was rumors that were spreading among the indian soldiers regarding the new cartridges they had been issued.the rumors said that there cartridges were made with either pork or beef fat, this would have made the soldiers violate there religious laws
The explosion of U.S.S Maine off the shore of Cuba (with the reason of explosion or the perpetrators still unknown today) set off the war between the US and Spain in the Spanish-American War
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C. Obstruction of justice and lying under oath
The federal government passed laws allowing people to sell back land they could not pay for and use the money to pay their debt. States made it more difficult to foreclose on mortgages and tried to make it easier for people to declare bankruptcy.