What was the inundation?

The actors spoke loudly clearly and confidently. punctuate this sentence using the oxford comma

The conventions of a number of the states, having at the time of their adopting the constitution, expressed a desire, in order to prevent misconstruction or abuse of its powers, that further declaratory and restrictive clauses should be added: and as extending the ground of public confidence in the government, will best ensure the beneficent ends of its institution. what is meant by the phrase "further declaratory and restrictive clauses"?

What syllables in "arrived" are stressed/unstressed?