引擎：Google
问题：how long has been the US requesting for Greenland？
回答：
The
United States
has sought to acquire
Greenland
for approximately 159 years, with interest dating back to the mid-19th century. Key periods of U.S. interest and formal requests include:
- 1867–1868 (Initial Proposal): Following the purchase of Alaska, Secretary of State William H. Seward commissioned a report on Greenland’s resources and considered purchasing it (along with Iceland) to expand U.S. control in the Arctic.
- 1910 (Land Swap Proposal): The U.S. ambassador to Denmark proposed a three-way trade involving territories in the Philippines, but the plan was never officially acted upon.
- 1946 (First Formal Offer): After World War II, President Harry Truman made a formal offer of $100 million in gold to purchase Greenland. Denmark rejected the offer.
- 1950s (Cold War): The Pentagon remained interested in purchasing the island as late as 1955 due to its strategic position between the U.S. and the Soviet Union.
- 2019 (Renewed Public Interest): President Donald Trump publicly confirmed his interest in buying Greenland, calling it a "large real estate deal," which was again rebuffed by Danish and Greenlandic authorities.
- 2024–2026 (Recent Escalation): After winning the 2024 election, Trump revived his offer to acquire Greenland. As of January 2026, the administration has categorized the acquisition as a "national security priority". Recent reports indicate that the U.S. has not ruled out using military force or economic pressure, such as tariffs, to achieve this goal.
While these purchase attempts failed, the U.S. has maintained a continuous military presence on the island since 1941. This is currently governed by the 1951 Defense of Greenland Agreement, which allows the U.S. extensive military rights, including the operation of the Pituffik Space Base (formerly Thule Air Base).
