WASHINGTON—First Lady Melania Trump organized a lavish state dinner co-hosted by her husband President Donald Trump in honor of King Charles III of the United Kingdom of Great Britain and Northern Ireland, and Her Majesty Queen Camilla, at the White House on Tuesday night. The celebration recognized the special relationship between the two nations on America’s 250th anniversary. “The Declaration of Independence was a miracle for the ages that sparked a far-reaching revolution in self-government and human freedom,” Trump said. “But even though the political bonds between the United States and Great Britain were dissolved forever, they thought, on July 4th, 1776, the more powerful strands of memory, culture, and identity proved unbreakable in any conflict and grew into a friendship unlike any other on Earth....