The fight is not over, though Trump has approved it and it is about to start operations. The temporary success of Dec. 4th, requiring an Environmental Impact Statement has given way to Trump's Executive Order and the US Army Corps of Engineers closed down the process of getting comments on the EIS and issued the easement summarily, allowing construction to continue. On Feb 9th the Cheyenne River Sioux filed action in court against the easement. Standing Rock Sioux joined in this legal action. They lost in court on Feb 23rd when a federal judge refused their appeal. Finances are difficult, though. It has become more costly and has less likelihood of financial success due to the glut in the market and the price of oil being so low.
And this one for what to do now: https://www.theguardian.com/commentisfree/2017/apr/04/dakota-pipeline-discover-divestment-wells-fargo
White House Comment Line is open now
The White House
1600 Pennsylvania Avenue NW
Washington, DC 20500
Divest from the banks funding the pipeline and write a letter to your the bank as you do it. In Marin, this includes Citibank, Wells Fargo, Chase, Bank of America, US Bank, and Union Bank (owned by Bank of Tokyo-Mitsubishi UKJ). Bank of the West in Marin(owned by BNP Paribas which just divested their investments in the Pipeline in April as has ING, and DNB, Norways's largest financial services group already). You can go to www.defunddapl.org to record it and put a selfie of you on there as you did it.
This should help you in the process with names of banks you could switch your money to in Marin: http://d3n8a8pro7vhmx.cloudfront.net/350bayarea/mailings/853/attachments/original/Move_My_Money_1.26.17.pdf
Sites to help with donations:
The legal defense fund is most important right now: https://fundrazr.com/d19fAf
Oceti Sakowin Camp: http://www.ocetisakowincamp.org
Standing Rock Sioux Tribe: http://standwithstandingrock.net/donate/
Sacred Stone Camp: http://sacredstonecamp.org
Honor the Earth: https://honorearth.nationbuilder.com/donate