De or het massadeportatie?

The correct Dutch article is:

de massadeportatie

Rule Words ending in -tie and -sie: almost always de. See the rule

How to use massadeportatie

the massadeportatiede massadeportatie
this massadeportatiedeze massadeportatie
that massadeportatiedie massadeportatie
our massadeportatieonze massadeportatie
your massadeportatiejouw massadeportatie
every massadeportatieelke massadeportatie
which massadeportatie?welke massadeportatie?
a big massadeportatie / the big massadeportatieeen grote massadeportatie, de grote massadeportatie