Did political machines contribute positive or negat

What was the overall impact of eli whitneys introduction of interchangeable parts?

Why did einstein write a letter to president roosevelt

Select the correct answer from each drop-down menu. different sources are aimed at different audiences. sometimes a source can be directed at more than a single group of usually aimed at the general population across the globe. some sources may have a very specific audience. be specifically aimed at students or scholars with a background in literature.