Answer:
Soon, both soldiers as well as civilians began using the nickname Uncle Sam to refer to the United States.
Step-by-step explanation:
The most effective way to combine statement 11 and 12 is to use a conjunction to join them. Since both statements 11 and 12 have the same object but different subjects, we include a conjuction to join the 2 subjects[soldiers & civilians]. Hence, both statements are combined as seen below:
Soon, both soldiers as well as civilians began using the nickname Uncle Sam to refer to the United States.