Which amendment established the procedure to fill a vacancy in the office of the vice president?

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

Which of these played the biggest role in increased urbanization in the late 1800s? a) transportation improved b) the military was stronger c) no one was farming anymore d) steam power was discovered

In what was the 1851 indian appropriations act considered a peace plan according to the federal government