Destruction Shall Come upon Workers of Darkness

Alma teaches his son that the promised land (in the Americas) is cursed for all who work darkness.

“…There is a curse upon all this land, that destruction shall come upon all those workers of darkness, according to the power of God, when they are fully ripe…Yea, and cursed be the land forever and ever unto those workers of darkness and secret combinations, even unto destruction, except they repent before they are fully ripe.” (Alma 37:28;31)

Questions:

-Does the promised land referred to in this verse include all of the Americas?

-Does this verse suggest that the curse mention is perpetual on the promised land?