Claim: Slavery was legal in the United States for over 200 years.
Verdict: Correct (50% confidence)
Explanation: According to Wikipedia, slavery persisted in about half of the U.S. states until its abolition in 1865, confirming its legality (Wikipedia). History.com states that starting in 1662, the colony of Virginia and other English colonies established the legal status of slaves, which supports the claim that slavery was legal for over 200 years (History.com). National Geographic also notes that it took more than 200 years to end slavery, further supporting the timeframe (National Geographic). The evide...