What kind of state is the usa ? how many houses does the legislative branch consist of? who heads the executive branch of the country? how many courts does the judicial branch consist of?

The Legislative Branch consists of the House of Representatives and the Senate, which together form the United States Congress.
The head of government is the chief officer of the executive branch of a government.
In the United States, the federal Judicial Branch consists of four types of courts, not three. Most people overlook the US Court of International Trade; however, it is legitimately part of the Judicial Branch.
US District Courts (94)
US Court of International Trade (1)
US Court of Appeals Circuit Courts (13)
Supreme Court of the United States (1)