A wife cannot be forced to provide evidence against her husband in a court of law.
No. If the other person is legally married to another person in another state, then your marriage is not valid in the USA. You can have be legally married to one person at a time.
Only spouses, legally married to one another, are protected against testifying against their spouse in court. All others are not legally protected and can be charged with either "contempt" or "obstruction of justice" if they refuse to testify.
He can not get legally married to anyone until he is legally divorced from you.
Not if he is still legally married to you.
yep
Yes, if you are a joint defendant or hold jointly owned property.
No
Nothing. the law recognizes the legal husband as the legal father of the child.
If a judge issues a subpeona (an order to produce evidence, which can include testimony), then yes. Other than marriage, family relationships don't legally protect one family member from testifying against another.
If your relationship with one another doesn't fall under the legally protected status of "husband and wife" (including common-law marriage) then, yes, you can be compelled to testify against him.
no
The man who made you pregnant.