HOUSTON (AP) — Three years into Donald Trump's presidency, the U.S. government is ramping up its efforts to seize private land in Texas to build a border wall.

Trump's signature campaign promise has consistently faced political, legal, and environmental obstacles in Texas, which has the largest section of the U.S.-Mexico border, most of it without fencing. And much of the land along the Rio Grande, the river that forms the border in Texas, is privately held and environmentally sensitive.

Almost no land has been taken so far. But Department of Justice lawyers have filed three lawsuits this mont...