The opening query is presented, loosely, in the past tense, assuming that you are not currently a reader of Watchtower publications.
Not that I'm already rather certain of your reply, it's just that I would like to know if in your English-speaking country (or ESL [English as Second Language]) THE SOCIETY deigned to tailor the publications to your spellings, expressions, idiomatic renderings, etc. As you will read below, so-called American English is a dialect of English.
I found this online under American English vs. British English:
"American" is not a language; "American English" is a dialect of English. "Americans write and speak differently than citizens of England" is just barely true. The differences between the two dialects are limited and superficial. There is no problem of mutual unintelligibility.