Final answer:
The opportunity for the Jefferson administration to purchase Louisiana was created by politics events in Europe such as the Treaty of San Ildefonso and the Napoleonic Wars.
Step-by-step explanation:
The opportunity for the Jefferson administration to purchase Louisiana was created by politics events in Europe such as the Treaty of San Ildefonso and the Napoleonic Wars. In 1800, the secret Treaty of San Ildefonso between France and Spain transferred the Louisiana territory from Spanish control to French control. Then, the events of the Napoleonic Wars weakened France financially and militarily, prompting Napoleon to sell the Louisiana territory to the United States in 1803.
Learn more about Events in Europe and the Louisiana Purchase