You can tell if they were influenced either negatively or positively by looking at their connotation and diction
The both had people die men fought in both
the locations are different
The type of sentence given is a compound sentence. It is a compound sentence because it consists of two independent sentences: "I already said yes to someone else" and "I can't go to the dance with you". In order to link the two sentences, the conjunction "because" is used.