How could these sentences be effectively combined with a coordinating conjunction?

The United States joined the coalition. The United Kingdom also joined. France would have nothing to do with it.

The United States and the United Kingdom joined the coalition; France would have nothing to do with it.

The United States and the United Kingdom joined the coalition, but France would have nothing to do with it.

Answer: The United States and the United Kingdom joined the coalition, but France would have nothing to do with it.

Explanation: Coordinanting conjunctions are words that connect or coordinate two or more sentences, words or others that have the same syntactic importance ... They are usually used to equally emphasize the main clauses. There are 7 of them: for, and, nor, but, or, yet, so and to use it correctly you can follow some rules:

1) They always connect phrases, words and clauses;

2) You can use them in the beginning of the sentence if:

you ensure the conjunction is immediately followed by the main cause; to make the writing more effective; don't use comma after the coordinating conjunction;

Therefore, the sentences above combined could be:

The United States and the United Kingdom joined the coalition, but France would have nothing to do with it