Please correct my paraphrases. thank you!

“When does a rising power become a threat? There is seldom a single moment. Anglo-German antagonism was still a relatively new phenomenon; an alliance between the tow empires seemed plausible as late as 1899. Likewise, the United States took time to identify as a serious rival in the pacific religion; it was not until the 1930s that relations really soured. In both cases, the perception of a strategic threat was slow to grow. But grow it did-and ultimately led to war. Could the same be happening to the and today?”



“For a time, Chimerica seemed like a marriage made in heaven.”



Correct me if I’m wrong. Thank you!

1: There is seldom a single moment. = There is many example of it.

2: the perception of a strategic threat was slow to grow. = It took the United States to realize that is a threat.

3: Could the same be happening to the and today?

In this sentence, why is it “could be happening ” rather than “could happen”?

4: a marriage made in heave= a perfect marriage.