What did King Willem-Alexander do on the 160th anniversary of Slavery's abolition?

 the HILL report

The King of Netherlands' monarchy,Willem-Alexander, apologized 

for the Netherlands

role in the slave trade (up to 1863) and transporting against 

their will, the slave populations of

S. America and the Caribbean (Aruba, Curacao, Sint Maarten, Sint Eustathius, other islands).

https://thehill.com/policy/international/4077536-dutch-king-apologizes-for-countrys-historic-role-in-slave-trade/