Ilhan Omar in an October file photo.
She said her political life began attending local Democratic Farmer Labor party caucuses with her grandfather after arriving in the US.
A Somali-American and a former refugee, she served as the first Somali-American legislator in the US when she won a seat in the Minnesota House of Representatives in 2016.
She is not only the second Muslim women elected in Congress but also the first Somali-American.
Omar, who arrived in the United States at the age of 14 after fleeing civil war in Somalia and lived in Kenya's Dadaab camp, campaigned on a platform which called for universal healthcare and tuition-free colleges.
She chose to run for Congress after Ellison, who is also black, made a decision to give up his seat after 12 years in Congress to run for attorney general of Minnesota.
She was born on July 24, 1976, to working-class Palestinian immigrants in Detroit and is the eldest of 14 children.
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She shared: "We changed the course of history at a time we thought it was impossible".
The seat she won is in a predominantly African-American congressional district with few Muslim voters.
She is expected to share the honour with Somali-American Ilhan Omar, who was leading the opinion polls in Minnesota.
What is already the most diverse Congress ever could become even more so after Tuesday's elections and will include several trailblazers.
Tlaib has advocated for universal health care, a $15 national minimum wage, union protections, and tuition-free college education.
Tlaib's win comes after the 2016 election of Trump spurred a record number of women to put their names on the ballot. She has a bachelor's degree in politics from North Dakota State University and has also studied public affairs.
During her tearful primary election victory speech in August, with her immigrant mother by her side, she said relatives in the West Bank were watching her success.