The haymarket affair: group of answer choices was started by the knights of labor. was blamed on seven anarchist leaders despite a lack of evidence. took place in san francisco. led to passage of the foran act of 1885. marked the beginning of the federation of organized trades and labor unions.

The answer is:

was blamed on seven anarchist leaders despite a lack of evidence.

Explanation:

The Haymarket affair was a  violent confrontation between police and labor protesters in Chicago it occurred on May 4, 1886, it turned into a riot after someone threw a bomb at police. Eight radical labor activists were convicted in connection with the bombing. One of the condemned men killed himself in prison, and four others were hanged on November 11, 1887. Two of the men had their death sentences commuted to life in prison by the governor of Illinois.

The incident was viewed as a setback for the organized labor movement in America.

answer: an oligarchy is a political system in which the government is run by a group of noble families, or the elite wealthy members of a society. a present day oligarchic government is iran.

explanation:

the federal constitution of the united mexican states of 1824 was enacted on october 4 of 1824, after the overthrow of the mexican empire of agustin de iturbide. in the new constitution, the republic took the name of of united mexican states. it was replaced by the federal constitution of the united mexican states in 1857.