What unfortunate event inspired lucretia mott and elizabeth cady stanton to plan a women's rights convention?

 At the World Anti-Slavery Convention in London in 1840, women in attendance were segregated from men and were not allowed full access to the proceedings.  Mott and Cady Stanton left the convention because of that rule, and decided they would form a society and plan a convention to promote women's rights.

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Attending the 1840 abolitionist convention in London was when Elizabeth Cady Stanton first met.  They both had been sent as official delegates to the convention, representing groups in America.  But when they arrived and were told that women would not have full participation and should rely on men to speak for them, they left.  As Cady Stanton remembered it, she and Mott "walked arm in arm, commenting on the incidents of the day," and "resolved to hold a convention as soon as we returned home, and form a society to advocate the rights of women" (quoted in New York Historical Society resource page, 2017).

The convention that was planned by Mott and Cady Stanton took place in 1848, in Seneca Falls, New York.  It  was the first women's rights convention to be held in the United States, and was organized by women. Elizabeth Cady Stanton was lead author of an important document issued by what we now call the "Seneca Falls Convention."  The Declaration of Sentiments was signed by 68 women and 32 men who had been among the participants in the convention. The document was modeled after Thomas Jefferson's Declaration of Independence.  In the way that Jefferson had listed grievances against the British monarchy, the Declaration of Sentiments listed grievances against how man had oppressed woman in regard to civil rights.  

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the california missions began in the late 18th century as an effort to convert native americans to catholicism and expand european territory. there were 21 missions in all, lasting from 1769 until about 1833.   the missions were built by the spanish starting in 1769 in order to “colonize” the territory of alta california. so the missions were important because they were the means of settling california. it also wanted to keep other european countries out of alta california. building settlements along the coast would them meet these goals. missionaries wanted to convert the indians to the roman catholic faith. california indians did much of the work to build missions.