What's the difference between 逼, 迫, and 逼迫?
http://xh.5156edu.com/html3/4820.html
  
  逼,近也。——《说文新附》
  
  逼, means 'to approach and get close to'


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  http://xh.5156edu.com/html3/4732.html
  
  迫: 用强力压制 (use force to press)


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  http://xh.5156edu.com/html5/z32m80j144802.html
  
  逼迫: to force;to compel;to press


逼迫(approach and forcefully press) = 'to force/ to compel/ to press' 

It is a compound word 

逼 and 迫 are very similar, but there are subtle difference


逼: by approach extremely close, you are in effect pressing the object
迫: by forcefully pressing, you are extremely close to the object


In my experience, many people use 逼 and 迫 interchangeably

I have no problem with people using 逼 or 迫 for 'press' as in '逼切/'迫切 (pressingly close = urgent) 

But I object using 迫 instead of 逼 for 'approach' as in '颱風逼近' (typhoon approaching) 


  Do they all carry the same connotation of “to force?”



迫 and 逼迫 mean 'to force' directly
逼 means 'to force' by extended meaning  (approaching --> pressing --> forcing)


Cantonese only use 迫 or 逼 for 'to force'. 
We do not use the term 逼迫