Big Law firms have been planting flags in Texas since the early 1980s, launching a trend that’s accelerated over the decades with Am Law 200 firms currently operating more than 150 offices in the coveted Texas market.

Jones Day, founded more than 100 years ago in Cleveland, may have the oldest Texas office of any Am Law 200 firm not founded in the state. It moved into Texas in 1981 by acquiring Dallas’ Meyers Miller Middleton Weiner & Warren, employing an expansion strategy still used today as national and international firms jostle to put down roots in the Lone Star State.