Question

we are proud of our heritage. (replacing with verbs)

Answer 1

Some verbs are followed by a direct object and the infinitive(see verbs followed by ... disappointed; glad; sad; happy; anxious; pleased; surprised; proud; unhappy ... We were happy because we had come to the end of our journey .... You could replace to make with in order to make here and the meaning would be the same.

Answer 2

our heritage make us proud