King john agreed to sign the magna carta because of the widespread opposition to his rule among which of these groups?

The barons were the ones to oppose the kings barbarous acts. The barons had even captured London to force him to negotiate.  

the federalist party which advocated strong centralization dominated the united states government till 1800. so 1800 election transformed the power from one party to another party for the first time and was thus a turning point in american history. so jefferson called it "revolution of 1800".

explanation:

they were byzantines