On this day 250 years ago in London, the Parliament declares Massachusetts in rebellion:

we find, that a part of your Majesty’s subjects in the province of the Massachusetts Bay have proceeded so far to resist the authority of the supreme legislature, that a rebellion at this time actually exists within the said province

https://alphahistory.com/americanrevolution/rebellion-declared-massachusetts-1775/

Also on this day in Cambridge, Massachusetts, the Provincial Congress: names John Hancock, Joseph Warren, Benjamin Church, Richard Devens, Benjamin White, Joseph Palmer, Abraham Watson, Azor Orne, John Pigeon, William Heath, and Jabez Fisher as a “committee of safety” to govern the Province when the Provincial Congress was not in session; reappoints Jedediah Preble, Artemas Ward, and Seth Pomeroy and adds William Heath and John Thomas as generals to command the militia; and appoints a committee of supplies to provide arms and equipment for the militia. The Provincial Congress also issues a remarkable address “To the Inhabitants of the Massachusetts Bay”:

When a people entitled to that freedom, which your ancestors have nobly preserved, as the richest inheritance of their children, are invaded by the hand of oppression, and trampled on by the merciless feet of tyranny, resistance is so far from being criminal, that it becomes the christian and social duty of each individual.

. . . you ought to entertain and cultivate in your minds, the highest gratitude to the Supreme Being, for his having placed you under such a form of government, as, when duly administered, gives the meanest peasant the same security in his life and property, as his sovereign has in his crown.

This constitution of government secures to each one subject thereto, such an entire property in his inheritance and the fruit of his industry, that they cannot be taken from him without his personal or representative consent

. . .

Fleets, troops, and every implement of war, are sent into the province, with apparent design to wrest from you that freedom which it is your duty, even at the risk of your lives, to hand inviolate to posterity.

Those strides of tyranny have fixed the united attention of all America; and, being greatly and justly alarmed, the wisdom of the whole continent has been collected in that Congress, whose salutary resolutions have pointed you to effectual means of redress, and the execution of the plan projected by that honorable assembly, has been warmly recommended to you by your former Provincial Congress.

The transactions of your former Congress, with regard to placing the militia on such a footing as may serve to defend you from each act of hostility that may be offered, have been carefully transmitted to you, and we rejoice to hear, that you have cheerfully paid the strictest attention to them, and ardently wish that the same martial spirit which so remarkably prevails among you may be encouraged and increased.

Though we deprecate a rupture with the mother state, yet we must still urge you to every preparation for your necessary defence ; for, unless you exhibit to your enemies such a firmness as shall convince them that you are worthy of that freedom your ancestors fled here to enjoy, you have nothing to expect but the vilest and most abject slavery.

. . . Such is the alarming state of the province that the necessity of punctually complying with these resolves [of the First Provincial Congress] can, by no means, need any further argument to stimulate thereto, than what naturally arises from facts under your constant observation ; but as necessary preparations for your defence require immediate supplies of money, duty and faithfulness to you, compel us to take leave to hint, that, should you be so unhappy as to be driven to unsheath the sword, in defence of your lives and properties, the having proper magazines duly prepared, may give that success which cannot he expected without them.

. . . we are assured, that, as you hitherto have, you will continue still strictly to adhere to the resolutions of your several congresses ; for we can conceive of no greater punishment for the breach of human laws, than the misery that must inevitably follow your disregarding the plans, that have, by your authority, with that of the whole continent, been projected.

Your conduct hitherto, under the severest trials, has been worthy of you as men and christians, and, notwithstanding the pains that have been taken by your enemies, to inculcate the doctrines of non-resistance and passive obedience, and, by every art, to delude and terrify you, the whole continent of America has, this day, cause to rejoice in your firmness. We trust you will still continue steadfast, and having regard to the dignity of your characters as freemen, and those generous sentiments resulting from your natural and political connections, you will never submit your necks to the galling yoke of despotism prepared for you ; but with a proper sense of your dependance on God, nobly defend those rights which Heaven gave, and no man ought to take from us.

Sources: https://archive.org/details/journalsofeachprma00mass/page/88/mode/2up?view=theater at pp. 89-93; Nortoon at 334-335