Did Canada have a real choice about whether
to enter NATO and NORAD?

Politically speaking, Canada did have a very real choice and could have rejected the offer to join them.

Explanation:

Realistically though, Canada became one of the founding members of NATO because of it's contribution and losses in World War II and how it believed that NATO could ensure lasting peace in the western world.

Similarly, NORAD was a join proposal from both the governments in order to provide better airspace defense. Canada did give more power to the US, e.g. the headquarters is based in Colorado and the Commander of the organisation will always be an American.

pepin the short[a] (german: pippin der kurze, french: pépin le bref, c. 714 – 24 september 768) was the king of the franks from 751 until his death. he was the first of the carolingians to become king.[b][2]

the younger son of the frankish prince charles martel and his wife rotrude, pepin's upbringing was distinguished by the ecclesiastical education he had received from the monks of st. denis. succeeding his father as the mayor of the palace in 741, pepin reigned over francia jointly with his elder brother carloman. pepin ruled in neustria, burgundy, and provence, while his brother carloman established himself in austrasia, alemannia and thuringia. the brothers were active in suppressing revolts led by the bavarians, aquitanians, saxons, and the alemanni in the early years of their reign. in 743, they ended the frankish interregnum by choosing childeric iii, who was to be the last merovingian monarch, as figurehead king of the franks.

when in doubt choose c

it's what my teacher told my class when we were going into psats