VIDEO: X Factor's One Direction kick off their US promo tour!

One Direction tour

One Direction kicked off their American promo tour in the states this week, with thousands of screaming fans packing out venues across the country.

The boys, who debuted on the American charts last week, will be releasing their first album Up All Night in the States next month.

They've already seen some success, being named the highest charting new UK act in the country for some 14 years, but face stiff competition from rival UK boyband The Wanted, who are also trying to break the lucrative market.

While the venues One Direction are currently playing don't exactly compare to the 28,000 seat O2 Arena they sold out six times over at the weekend, the boys are certainly on their way to success.

Watch a clip of their performance in Chicago below...

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