Who invented the hamburger? Many different cultures, towns, and restaurants have tried to "steak" the claim of creating the first mouth-watering burger; but the truth is, it developed with small changes over time. Some historians think the dish is inspired by Genghis Khan and his hungry hoard of Mongolians. They took meat with them into battle, hidden under their saddles, and ate the flattened steaks afterward - raw. When the Mongols invaded Moscow in the thirteenth century, the Russians adapted the idea, adding spices and onions. The dish eventually made its way from Russia to the port town of Hamburg, Germany, where it was adapted further. In the eighteenth century, Germans began asking for their steak "Hamburg style," which meant ground, seasoned meat, shaped into patties, and quickly grilled. The hamburger reached America in the nineteenth century when sailors and immigrants travelling from Germany brought the dish with them. In the 1920's, the burger finally met its mate: the bun. Many American restaurants began featuring it on their menus, each one claiming to be the "home of the hamburger." These small changes, made over centuries, contributed to one of the most popular foods in the world: the mighty hamburger. Which of these lists the correct main idea and major details of this excerpt?