Which historical factor most influenced the breakup of the Soviet Union in 1991

The collapse of the USSR was the process of systemic disintegration in the social structure, national economy, and political sphere of the Soviet Union, which led to the termination of its existence on December 26, 1991.  

The disintegration process began in the second half of the 1980s with the beginning of perestroika; manifested itself, in particular, in the desire of the Soviet republics for greater state and economic independence from the central government and ended with the signing of the Belovezhskaya agreements on December 8 and the Alma-Ata declaration on December 21, establishing a confederal union of former Soviet republics, the Commonwealth of Independent States and the adoption of the declaration on the termination of the existence of the USSR on December 26, 1991.

native americans suffered high rates of poverty and unemployment.

during the late 1960s and early 1970sthe need for political militancy grew among the native americans. throughout the 1960s, they had been the nation's poorest minority group, the most deprived group, according to practically every socioeconomic measure. in 1970, the indian unemployment rate was 10 times the national average, and 40 percent of the native american people were below the poverty line.

the installment plan of the 1920s, an arrangement that allowed people to buy what they wanted with a small down payment and pay off the rest in monthly installments, provided americans a way to own what they did not have the money to buy.