Chinook Jargon developed as a pidgin used in trading interactions between the people of the Pacific Northwest in the USA and Canada during the 19th century. It first emerged along the lower Columbia River, and then spread to other parts of what are now Oregon and Washington states, and to British Columbia, Alaska and Yukon Territory.
Much of the vocabulary of Chinook Jargon comes from the languages of the Chinook people, only one of which, Upper Chinook (Kiksht), is still spoken, though the last fully fluent speaker died in 2012. Chinook Jargon also includes words from English and French, as well as from a variety of local indigenous languge. It has a small vocabularly, and a simple grammar, so is easy to learn.
The peak Chinook Jargon usage was between about 1858 and 1900 with an estimated 100,000 speakers. After this it declined, though continued to be used in some business sectors into the 20th century, particularly by members of the Arctic Club in Seattle until about 1939.
Chinuk pipa is a script for Chinook Jargon based on Duployan Shorthand/Stenography, which was first created in 1860 by Emile Duployé as a way to write French quickly. It was also adapted for writing English, German, Spanish and Romanian. Father Jean-Marie Raphaël Le Jeune came to British Columbia as a missionary in about 1879 and realised that the Latin alphabet was not ideal for writing the Chinook languages decided to adapt Duployan Shorthand instead. He published a newspaper, Kamloops Wawa, in Chinook Jargon written in his adapted version of the shorthand in the 1890s, and hundreds of speakers of Chinook Jargon learnt to read and write using this script. It was also used to publish a number of religious and classical works, and to write diaries.
Duployan Shorthand was also adapted by Denis-Romulus Perrault, a stenographer from Montreal, to write a number of other indigenous languages in Quebec and Newfoundland, and is still used to write the Okanagan, Lillooet, Shushwap and North Thompson languages in British Columbia.
Source: http://chinookjargon.com/2013/12/05/visit-to-skwamish-a-cj-text/ - includes transliteration and translation
Information about the Chinook Jargon language and the Chinuk pipa script
Chinook Jargon Phrasebook
Information about Duployan Shorthand