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This liberal myth has been floating around since the campaign.
Joshua Rojas, 25 and Alyssa Young, 28, had traveled from Texas to watch the inauguration. Young was wearing a pink "Make America Great Again" hat.
"I loved it as soon as I saw it. I bought it right over there from one of the vendors for $20," she said.
So was it made in America?
"I don't know where it was made actually," Young said. "Let me check." She took off the hat to check the label. "Oh no," she cried. "It's made in Vietnam!"
Austin Araco, 22, from Arkansas, was attending his first inauguration and wearing a Trump hat.
"I bought this hat the day he won the election," said Araco. "From his website, of course. I wanted to make sure I supported his fund. I don't want to buy a knock-off. I bought the hat for $30, shipping included."
Victoria Scott, 13 and her brother Andrew Scott, 12, each bought a "Make America Great Again" hat before the inauguration. Victoria's hat cost $25 - and was made in China.
She did not seem to mind.
Andrew then checked his hat. "Banglakesh?" he said after checking the tag. His father corrected him. "You mean Bangladesh."
Robert Morrison from Queens, New York, was carrying his "Make America Great Again" hat - bought from a street vendor for $20 - and wearing a New York Yankees cap. Both were made in China.
In his speech, Trump struck a fiery, protectionist tone.
"From this moment on, it's going to be America First," he said. "We will follow two simple rules: Buy American and hire American."