Checks and balances
supreme court is granted power to overturn congressional laws that violate constitution. the courts however should exercise judicial constrain while doing that, to ensure the do not injure the principle of separation of power. usually they all restrain themselves to comparing whether the new law contradict the establishment clauses which would require a referendum, or the wording and legal process was followed. This ensures congress is checked.
You have to be a certain age when you vote in the u.s whereas some countries are not eligible to do that, in some countries women are not allowed to vote but things has changed.<span />
The Americans had George Washington who trained them to fight and how to avoid smallpox also they knew where they where fighting so they could hide very well
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Honestly, none. The union didn't really have any agricultural advantages over the Confederacy, in fact, it can be argued that agriculture was one of the biggest disadvantages of the union.
The answer is, Battle of Fort McHenry