I'll do you the respect of assuming you are sincere in wanting to know.
The men who framed the constitution of the United States understood that in order for the union to be strong they would need a political mechanism that gave small states a reason to want to stay. If every question came down to a simple majority vote, then small states, or for that matter whole regions, would not have a voice. Led by James Madison, the founders came up with the very smart solution of creating two legislative houses that had to work together to pass bills, the House of Representatives which assigns seats by population and the Senate which gives each State two Senators--regardless of population. Together they form Congress and with the separation of powers of the Presidency and Judiciary, you get a fairly complex system of checks and balances that requires compromise in the best sense of the word.
Of course, it's not perfect. Jerrymandering and other politically opportunistic tinkering has posed an enormous challenge to the way the system is supposed to work. In defense of the founders though, they never intended for the thing to last two hundred years without changing. They (especially Thomas Jefferson) , had the perhaps naive faith that their descendants would be able to modify and improve the Constitution and adapt it to a changing world.