How did the brotherhood of steel arrive in the commonwealth?

The Brotherhood of steel heard about the synths in the commonwealth and they decided to take action and go to the commonwealth in their airship called the Prydwyn if you side with them they will later on destroy the Institute the source of all the synths.

me no say

the federal government of the united states was established by the constitution. us is a presidential republic. the president is head of state, head of government and of a two party legislative and electoral system. the supreme court balances the powers of the federal and the state government. yhe executive branch is headed by the oresident. there are two chambers of congress, the senate and the house of representatives. judicial power is exercised by the judicial branch (or judiciary), comprised of the supreme court and lower federal courts. the judiciary's function is to interpret the   constitution as well as the federal laws and regulations.