How did lincoln's approach to slavery change between 1860 and 1865?

The system of checks and balances ensures that

What are the biggest challenges facing the average american citizen today? explain.

All of the following were weaknesses of the articles of confederation, except: a) the central government was not permitted to regulate state, interstate, or foreign trade. b) the central government was not permitted to borrow money. c) the central government had little ability to regulate money. d) the central government had no ability to tax.