There are no major conflicts between the US and UK. Both are allies within NATO.
A major armed conflict between Spain and the US fought in support of Cuban Independence from Spain.
WWII
the battle of wounded knee
The Hague Convention addresses parental abduction between the US and the UK. Google it.
The US and the UK have had many agreements over the years.
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Because Japan only had enough oil in their reserves to support a 2 year war.
Cold War
Cold War
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The UK is a monarchy and the US is a republic.
Depending on where you are in america - between 5 & 8 hours behind UK time.