Simplify the following text for a Grade 7 native English-speaking person.
Original: In addition , it is a future where the only two surviving superpowers , the United States and China , fused to form the central federal government , called the Alliance , resulting in the fusion of the two cultures as well .
Simplified: It is a future where the only two superpowers , the United States and China , joined to create a single government . This government was called the Alliance .