"is" is inconsistent with "repercussions .. to this day". You'll need "was".
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SuperESLWhat if I add 'considered' after 'is'? This should make 'is' the right choice, correct?"The Vietnam War is considered a seismic event ...That works. That way the consideration is in the present, not the war or the seismic event.
SuperESLI mean, "be" means "to exist; to be present."That's just one meaning. Sometim
SuperESLOf all the things that have happened today, the sunrise this morning is the most memorable.You've made 'is' correct by abstracting 'things that have happened' into an inert list. You're mentally looking at your (timeless) list and selecting an item from it. It's almost as if you are no longer speaking about the sunrise this morning, but about "the s