Please help i’ll give brainlist

What impact did new technologies in the assembly and manufacturing have on the auto industry in the 1920s

How did the iran-contra affair impact the conflict between the united states and the soviet union? what role did the iran-contra affair play in both iran and nicaragua?

15 points to the "charlemagne" section, what were the two policies that charlemagne implemented when he took the throne? what was the result of the policies and how did it impact his warriors?