Unfortunately the your Bible verses don't support that God is cursing America.
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1. Genesis 12:7 "I will bless those who bless you,
And I will curse him who curses you;"
God is talking specifically about Abram. Those who bless Abram will be blessed by God and those who curse Abram will be cursed by God.
And I will bless them that bless thee, and curse him that curseth thee: and in thee shall all families of the earth be blessed. KJV
It doesn't apply to Abrams descendants or the current state of Israel.
Thee is singular.
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2. God destroyed Sodom and Gohmorra by fire so suddenly that no one escaped, due to the prevelance of homosexuality, i.e. a city from which the term sodomy was derived to depict homosexuality
The story does not say that the cities were destroyed due to the prevalence of homosexuality.
God said that the outcry against the cities was so great and their sin so grievous that the cities would be destroyed. It was nonspecific. (Genesis 18:20-21) Even the messengers did not make the accusation more specific. (Genesis 19:13)