@AndrewA87 , I am not sure I understand your question -- missing antecedents.
The totalization agreement is for the purpose of allowing participants to pay to ONLY one country viz. if an American citizen is domiciled and employed in Canada, he can choose ( under the totalization agreement between US and Canada ) to pay to only one country. Obviously that means downstream he will have to choose to get benefits from one country ( either because he contributed to that SSA system and/ or because he transferred contributions from the other system).
Is this what you are talking about ?
