HELPPP In 1787, the U. S constitution did which of the following?(Choose all that apply)
A-created a stronger national government than was allowed under the Articles
B-abolished slavery in all 13 states
C-gave most of the power to the individual states government
D-created a system of checks and balances
E-created a unicameral (one-house) legislature
F-established a separation of powers among three branches of government
G-established the supreme court as the most powerful branches
H-established the office of the president