In your opinion, was it a justified (good enough) reason to invade a country?

In my opinion it is justified to invade a country if they kill one of your countries officials. For example ww1 began when Syria killed the duke and his wife of the Austro-Hungarian empire which the Austro-Hungarians inaded Syria.

Explanation:

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the pogroms became known as kristallnacht, the "night of shattered glass," for the shattered glass from the store windows that littered the streets. the morning after the pogroms 30,000 german jewish men were arrested for the "crime" of being jewish and sent to concentration camps, where hundreds of them perished.