The reason why is England is about 3,000 miles away so it was tough to get supplies etc. to the colonists.
The national government got stronger thanks to the Articles of Confederation being replaced with the US Constitution. The Articles of Confederation was America's first constitution. This constitution lasted roughly a decade, as it was extremely ineffective and gave the federal government very little power. For example, the federal government could not collect taxes or force states to follow national laws.
When the US Constitution was passed, the federal government gained significant power. This included the creation of an executive branch, the idea that federal laws trump state laws, and the ability to raise funds in order to create a national military.
A - to pay off the debts from the French and Indian War
The British Parliment felt they had the right to tax the colonies to pay off their war debts they had incurred during the Seven Years' War.
It requires that 50 percent of a states white male take a loyalty oath to be readmitted to the union.