Which of the following triggered the second industrial revolution?

a. geologists discovered vast quantities of petroleum in germany
b. entrepreneurs figured out how to extract coal much more efficiently
c. innovators figured out how to produce steel cheaply
d. engineers developed a much faster steam engine

How does this cartoon represent an argument for the ratification of the constitution

Brainliestttme : ) what demographic changes occurred after world war ii?

Match each idea to the correct principle of government. federalism separation of powers checks and balances divides the powers of government into different branches arrowright divides the powers of government between central and state governments arrowright each branch of government has certain powers that prevents the abuse of power on the people arrowright