Sentence:  To promote its interests, by rendering the United States subsidiary; to conquer the mind of this country by conforming American ideas to French theories, were objects sufficient to engage all the efforts of these restless aliens, who gladly arrayed themselves under its political agents in their mission to <WSD>apostolize</WSD> this western world. 
Meaning of the word marked with <WSD> tags:  To covert; to proselytize.