When the authors of our Constitution included the phrase "ensure the blessings of liberty to ourselves and our posterity," what were they wanting to make sure would happen?

They hoped the country would never fall under an oppressive and limiting government.

Explanation:

With that phrase, the founders of the constitution hoped to found a country where freedom was such an ingrained and well-established term that it was impossible for the country to fall into the hands of an oppressive and limiting government.

The creation of the USA touched a lot on the subject of how oppressive and totalitarian governments, like those that concentrated power in the hand of a single person, were detrimental to the freedom of citizens. For this reason, they hoped that this type of government would never be established in the USA, so, for sure, freedom would be offered in the country for all generations.

d - failures.

the only attempted british colony in north america before 1600 was roanoke, virginia, which was a total failure. england claimed several areas, including newfoundland, but made no sustainable attempts to colonize them before 1600.