The 29-year-old will become the MLS outfit's third Designated Player on a free transfer following the expiry of his Baggies contract, with coach Caleb Porter hailing his qualities
The 29-year-old has played the entirety of his career in England with Midlands trio Aston Villa, Birmingham City and the Baggies.
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"Moving into the summer transfer window it was no secret we were looking to strengthen our squad with a top-level defender," head coach Caleb Porter told the club's official website.
"Liam is still in his prime at only 29 years old and he's been playing game in and out in the English Premier League versus many of the top attacking players in the world.
"This pedigree, along with his leadership qualities and technical ability as a left-sided central defender, makes him an ideal choice to enhance our backline for the second half of the season and beyond."