Survivor is a numbers game. The entire point of the competition is to get and keep a numerical advantage against your opponents. Generally speaking, if you have the numbers, you're safe.
The tribes merged on Wednesday's episode, creating a new 12-member tribe. (In a flash of patriotism, they named their tribe "Merica," a shortened version of "America." the flag colors, of course, were red, white and blue.
Also read: RECAP: Oilers 3, Blues 1