At the 1932 Summer Olympics, India defeated the USA with a score of 24-1.
Is this match the highest scoring match ever at international level?
Here somebody states:
In um Field Hockey it was 1994 when New Zealand pounded tiny American Samoa 36-1 in an Olympic qualifier. The Samaon goal came when a NZ defender put it in his own net, thus an own goal.
I couldn't verify that.
However, while looking for verification I did find this:
Kookaburras [Australia] slaughter Samoa 26-0 in World Cup qualifier
I assume that this is Samoa, the nation.
And then I found this.
Argentina men 30, Dominican Republic 0
Argentina women 25, Dominican Republic 0
Chile men 25, Dominican Republic 0
United States men 23, Dominican Republic 0
Argentina U-21 women 21, Dominican Republic 0
Chile women 20, Dominican Republic 0
Papua New Guinea (men and women) were beaten with monster scores by New Zealand and Australia, including
New Zealand 39 – 0 Papua New Guinea
For other contenders, you might want to check each of these.