The humans of the British colonies not was equal citizens. For this reason all was against British Empire.
British Empire sould to become democratic, but not made this. Continued the nationalism, and used violence. This made the humans more against British Empire.
Cyprus, made the same mistake. Cyprus not made fight for democracy, but made national fight.
For this reason "lost" the muslim minority.
For same reason India lost Pakistan.
So, if one country want be strong, need to abolish the nationalism, and need democracy-freedom-human rights.