Kosovo was established as a new country separated from Serbia by U.S. declaration.

Reasoning:

• The claim states Kosovo became a country via a U.S. declaration. In reality, Kosovo's own democratically-elected parliament declared independence on February 17, 2008, in Pristina — the declaration came from Kosovo's leaders, not from the United States¹.
• The United States recognized Kosovo's independence (along with 100+ other countries), but recognition is distinct from the act of declaring statehood; the U.S. did not "declare" Kosovo a country¹.
• The statehood process was UN-led (Security Council Resolution 1244 and the Ahtisaari Plan), and the ICJ ruled in 2010 that Kosovo's declaration "did not violate international law" — again, Kosovo's own declaration, not a U.S. one¹.
• No fact-check or credible source supports the idea that the U.S. created or declared Kosovo as a separate country; the closest related verified claim ("Europe created the fake state of Kosovo") was rated just 10% valid on the same reasoning¹.

Overall validity: 5%