In my opinion (though, I'm not a native-speaker), both Present Simple and Past Simple are ok in this sentence.
You can use Past Simple if you want to emphasize that the event was in the past, and you can use Present Simple if you want to indicate that from the point of view of the present there is indeed none greater than that wave of migration.
The problem can be solved on the basis of idiom ("more than") and modifiers (the opening phrase "of all the vast tides..." shouldn't modify the place-holder "it") as was indicated earlier in this thread.
You can use Past Simple if you want to emphasize that the event was in the past, and you can use Present Simple if you want to indicate that from the point of view of the present there is indeed none greater than that wave of migration.
The problem can be solved on the basis of idiom ("more than") and modifiers (the opening phrase "of all the vast tides..." shouldn't modify the place-holder "it") as was indicated earlier in this thread.
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