What was one result of the united states economic success in the late 1800s

Which political reform gave people the power to put a proposed law on the ballot? referendum initiative direct primary recall

What effect did increased automobile production have on other industries

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.