De or het naziagressie?

The correct Dutch article is:

de naziagressie

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

How to use naziagressie

the naziagressiede naziagressie
this naziagressiedeze naziagressie
that naziagressiedie naziagressie
our naziagressieonze naziagressie
your naziagressiejouw naziagressie
every naziagressieelke naziagressie
which naziagressie?welke naziagressie?
a big naziagressie / the big naziagressieeen grote naziagressie, de grote naziagressie