number1:From this list, the best option is "<span>Leaders must consider how one type of policy may affect the other since they relate" Foreign affairs have a direct impact on domestic affairs and vice versa.
number2:</span><span>1) weapons
number3:</span><span>National security
number4:</span><span>He will consider the opinions of the people, representatives, and diplomats.</span>
Im like 98% sure it happened in the US
Nativists objected primarily to Irish Roman Catholics because of their loyalty to the Pope and also because of their supposed rejection of republicanism as an American ideal.

So an iron triangle comprises or makes the base of the policy making relation over or among the congressional committees,the bureaucracy, etc.
Hope This Helps!!!
In summary, it would mean that slavery would be abolished, and that the nation would be in fact united, with (supposedly, it actually took a very long time for this to happen considering the KKK attacks) less racism in the U.S.