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This is a proposal for a final mission (series) to legislate away chemical warfare.
Previous missions by this time have caused significant chemical weapons stigma and reduction in the success of such enterprises from a corporate perspective. As of this writing the current count is England, France, and Japan (twice!). More missions targeting individual countries may be necessary to prepare public opinion for such a critical moment. (People's Africa, Australia, and Turkish Republic come to mind.)
This mission would take place in one of the remaining countries where less interference means chemical weapons are still being manufactured, which I have written in this draft as Mumbai, India. Inspired by the China-India reconciliation as the last major country-specific event listed before UE formation, I imagine the region around its alliance slightly bolstering its industry as elsewhere chemical corporations give up the practice.

Note on years: ~2700 may not mean "the year 2700" as written in the history post. Please read 2700 below as the exact year of the United Earth's formation and initial continental congresses, thus reading 2699 as "one year before the formation", et cetera.

ORIGINAL HISTORY:
The Pendharkar chemical conglomerate is the Indian stronghold of chemicals including weaponry, and it has Mumbai in its pocket, including the Maharashtra Times.
Firaki Deshmukh works on their floor until December 2696, when exposure to a vesicant gives her a bunch of very nasty symptoms such as blisters, corneal scarring, and respiratory impairment. She is given a large settlement, enabling her to leave her line of work and move back in with her father Bal.
In the year 2697, Bal Deshmukh marries a high-ranking member of Indian parliament, Madhuri Patel. [Bureaucratic issues] demand that they live separately, however, and Madhuri never meets Firaki face-to-face.
Madhuri Patel goes on to become a high-ranking member of the United Earth's government when it forms in 2700.

CHANGES:
* Sabotage of the Pendharkar conglomerate's affairs hampers:
** their settlement to Firaki Deshmukh
** their lining of Maharashtra Times coffers
* resolution of bureaucratic obstacles to cohabitation of married couples in different financial situations

ALTERED HISTORY:
Pendharkar still has to lay off Firaki Deshmukh after her 2696 maiming, but there is no settlement this time. Resentful, she moves back in with her father and they begin to consider taking their story to the Maharashtra times.
After Bal Deshmukh and wed in 2697, they live together with Firaki into Madhuri's superior household. Madhuri becomes personally affected by Firaki's condition, and her stepdaughter inspires her to. Resources are more easily shared within the family, and Firaki receives superior medical care that provides near-healthy respiration and sight, but her blistering is too severe - and politically useful.
By January 2698 the Maharashtra Times publishes a headline story about the articulate but irrevocably scarred poster girl for the harm of chemical weaponry.
Her stepmother begins serious advocacy within the Indian parliament for better legislation, and a law passes in 2699.
In the year ~2700, when the UE officially forms, Madhuri Patel proposes that chemical weapons be globally outlawed. After the regional controversy of the Firaki Deshmukh case, officials of Indian origins agree with Patel, while many other countries such as France and Britain had already come to the conclusion these were undesirable. The majority is soundly secured for legislation.