Which of these events happened just before Lincoln issued the preliminary Emancipation Proclamation?

preliminary Emancipation Proclamation

Explanation:

declared that as of January 1, 1863, all slaves in the states currently engaged in rebellion against the Union “shall be then, thenceforward, and forever free.”

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the correct answer is =   british soldiers attacked and killed five boston townspeople.

the conditions that made the byzantine empire vulnerable to attacks by the muslin turks were the sack of constantinople by western crusaders, the conquests of the sultanate of rum, presence of rival kingdoms and finally the set up of fiefdoms at the empire which were owned by the ghazis (turkish warriors).