It was a time of economic struggle, racial resentment and increasing xenophobia. Installed in the White House was a president who had never before held elected office. A moderately successful businessman, he promised American jobs for Americans—and made good on that promise by slashing immigration by nearly 90 percent.

He wore his hair parted down the middle, rather than elaborately piled on top, and his name was Herbert Hoover, not Donald Trump. But in the late 1920s and early 1930s, under the president’s watch, a wave of illegal and unconstitutional raids and deportations would alter the lives of as many as 1.8 million men, women and children—a threat that would seem to loom just as large in 2017 as it did back in 1929.

What became colloquially known as the “Mexican repatriation” efforts of 1929 to 1936 are a shameful and profoundly illustrative chapter in American history, yet they remain largely unknown—despite their broad and devastating impact. So much so that today, a different president is edging towards similar solutions, with none of the hesitation or concern that basic consciousness would seem to require.

Indeed, in the last several weeks, President Trump ordered the Department of Homeland Security to greatly increase not only the scope of potential deportees, but the speed at which they are being sent out of the country—a bid at “stabilization” borne of many of the same nationalist anxieties that plagued his predecessor nearly a century ago.