If you are using it as a proper name yes. If you are using it as an adjective then no.
The word citizen does not need to be capitalized.
No, the word forecast should not be capitalized in a sentence.
Yes it should be capitalized.
Have should be capitalized if it is the beginning of a sentence. Summer should not be capitalized.
No it shouldn't be capitalized.
No. It's written simply as "American citizen."
The word citizen does not need to be capitalized.
No, except at the beginning of a sentence because it is not a proper noun but American should always be capitalized.
Yes, "American wilderness" should be capitalized because it is a proper noun referring to a specific geographic area. However, "wilderness" in general would not be capitalized unless it is the first word in a sentence. So it would be "American wilderness," but "But how about wilderness."
Yes, the word "flag" should be capitalized if it is used as part of a proper noun, such as the "American Flag" or "Union Jack," or at the beginning of a sentence. Otherwise, it should not be capitalized.
In general, no, "transition process" should not be capitalized in a sentence.
Yes, "PC" should be capitalized in a sentence.
No, the word forecast should not be capitalized in a sentence.
Yes it should be capitalized.
No, "secondary students" should not be capitalized in the middle of a sentence unless it is a proper noun or at the beginning of a sentence.
No, the word "fifteen" should not be capitalized in a date within a sentence unless it is the first word of the sentence.
No, except at the beginning of a sentence because it is not a proper noun but American should always be capitalized.