Great Recession/Financial crisis of 2007-08 happens put worster in US, UK, Brazil, Euro, Russia and other devloping nations in Europe, Oceania and Asia. Put less worst in African countries and rest of South America.
Republican Party plummets member (due failed George W. Bush actions on crisis) to 26 million and Demcrats steadly declined to 29.7 million to Green Party with 4.5 million new members.
United States Presidental Election, 2008 - Cynthia McKinney won and first third party actually won in long time, putting Barack Obama in second place, and putting George W. Bush third place (causing Republican Party push back its status into first and only Third Party Opposition in United States and more fears its demise thus cause Republican Exdous by nearly (around 5 to 9 million) all them joining Democratic Party while several (1.5 million) joining Green Party, few joining (30,000 to 50,000) Reform Party and couple to joing ether (10,000) Libertarian Party or going Independent)
Biotechnological revolutions begins with Goverment apporval on gene editing on humans and repealed human-animal hybrid emybo testing by Ms. McKinney and its few elected Green senators throughout United States.
United States Presidental Election, 2012 - Cynthia McKinney won again, Hillary Clinton put second place (along abandoned its two of three official major ideologies (Progressivism and Social Liberalism in some issuses) with Liberal Conservatism as blow attempted getting Progressives back into Democratic party), put Gary Johnson in third place, Donald Trump in fourth place (cause official end of Republican Party after weeks planned ether merged with Democrats (as means attempted keep old establishment alive and very possibly means renamed as New Democratic-Republican Party or dissolved itself (which mostly likely did))
Cause Republican Party into second and final Exdous as membership downs to 15 million for more Joining Green Party, Reform, Libertarian and Constitution Parties.
This triggered UK membership of SNP, Plaid Cyrmu, UKIP, Green Parties in UK boosted with 35,000 (put Plaid Cyrmu get 12,000) new members.