Answer:
The aspect of the US Congress that most reflects the constitutional valve of republicanism is the existence of two congressional chambers, the House of Representatives and the Senate, which exercise joint power in legislative terms, and are jointly limited in such a way that both chambers must pass the bill so that it becomes law. In turn, another republican value that is reflected in the organization of Congress is the system of checks and balances through which Congress controls the actions of the other two branches of the federal state: the executive branch and the judicial branch.
The first one the change from nation to empire through imperialism
The assassination of Franz Ferdinand is what started WW1, which was done by Serbian rebels, but the county was Austria-Hungary. The two nations that escalated the conflict was Russia, who supported Serbia, and Germany, who supported Austria.