I would assume during the early stages of humans, we knew we lived in the Solar system, but we decide to use only since we thought we were the only people in the cosmos<span />
I think the answer is infinitive.
Were these the choices?
A.) Joseph is confused that things happened as they did at the courthouse in chapter three.
B.) In chapter three, the reader learns that Joseph feels weird about the way events happened at the courthouse.
C.) Joseph feels some confusion about the way things occurred at the courthouse in chapter three.
D.) In chapter three, the reader learns that Joseph feels confused about the events that occurred at the courthouse.
The best revision of this sentence would be letter D - In chapter three, the reader learns that Joseph feels confused about the events that occurred at the courthouse.
Both the original and revised mean the same thing - Joseph being confused at the happenings at the courthouse.
I believe the linking verb is “will”. It’s linking the subject “the United States of America” and the predicate “be 300 years old!”
I am going to go with answer D. I say this because you are informing the audience how to start a garden. Hope this helps.