the Kellogg-Briand Pact
A void agreement had a specific event, time and/or start that made the agreement void. You may write a check and it is given back to you with void written on it because of any reason you can think of. A illegal agreement is one that on it's face is not legal, such as you put a contract out on someones pet. That agreement would be illegal from the start so in effect there is no contract.
An illegal agreement is usually made in good faith, with out intent to defraud or mis-represent.Like if you inherit a house, try to sell it , and even tho you have the deed, find out there is a lien on it during the title search . You have entered into an illegal agreement and must return the deposit or earnest money you took in advance.
NATO
A secret agreement to perform an illegal act is called a conspiracy.
You need to specify the war; there have been quite a few in recorded history.
The soviets agreed to declare war on Japan
Price fixing (it is illegal).
The Kellogg–Briand Pact
kellogg briand pact
Slavery was made illegal by the 13th amendment during the civil war. Before slavery was made illegal people were still allowed to bring slaves into the country.
The agreement was signed by general John pop he was the one who had beeb serious to sign the peace agreement.