You can use essere d’accordo to say that you agree with someone. Because this expression contains essere, be sure you are using the right verb form.
Siamo d'accordo.
We agree.
I miei genitori sono d'accordo con te.
My parents agree with you.
Do you want to talk about politics in Italian? Here are some words that can come in handy.
Crediamo nella democrazia.
We believe in democracy.
Lui ha vinto le elezioni.
He won the elections.
Perché il governo non fa niente?
Why does the government do nothing?
Il Congresso sta parlando della nuova legge.
Congress is talking about the new law.
Ho il diritto di parlare.
I have the right to talk.