Although the Vietnam War ended in 1975, bombs and landmines laid by the US are still there and kill people to this day.
Trump's administration ordered the halting of funds to mine-clearing programs globally for at least three months, leaving these mines intact and able to kill people.
Additionally, given that China has been willing to step up and help clear mines, this will lead towards countries such as Vietnam, Cambodia, and Laos to build closer ties with Beijing rather than Washington.
The selfish among us may not care because it doesn't directly affect the US domestically, but this is still a cruel thing to do.