The Mexican-American war came from America taking Texas. Then that allowed us to receive even more land, more than 500,000.
Taxation without representation. It is mostly commonly shown as the Boston Tea Party, where they were complaining about the tea tax.
The Second Continental Congress started in May of 1775. One of the biggest issues this Congress had to address was the organization of military forces against the British. Even though the revolution already started, the colonists were extremely unorganized. This Congress creates a coordinated colonial army and nominate George Washington to be the commander in chief of the army. Along with this, the Second Continental Congress approves of the Declaration of Independence, which symbolizes an official break away from British control.