To not try and settle or trade in the Americas without officials consent.<span />
Answer:
It could have, but the ideology differences really did make them enemies just due to how fiercely loyal they were to them.
Explanation:
Unlike most wars this war was actually started by accident, and the Americans did not have a substantial military force there yet the navy was used because of this plus its was quite common for Philippe natives to dig tunnels, as japan would in WW2 <span />