What country touches our northern border and what country touches our southern border

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

The difference between ptolemy iii and ptolemy xiv

Ineed asap! ! what is the name of the system in which each branch of the u. s government can limit the actions of the other branches? a. perpetual union b. division of powers c. cooperative federalism d. checks and balances