As ABCNews.com marks 25 years, a look back at the biggest stories we covered

Contributing sentiments towards policy:

57% : The case behind the decision began in 2013, after the Supreme Court ruled that same-sex spouses must be afforded the same federal benefits as other married couples.
50% : In a historic decision, the U.S. Supreme Court ruled that the Constitution guaranteed a right to same-sex marriage in all 50 states.
36% : Both cases galvanized the Black Lives Matter movement launched in 2012 when Black teenager Trayvon Martin was fatally shot in Florida by neighborhood watch volunteer George Zimmerman.
34% : On April 15, 2013, two backpack bombs were detonated near the finish line of the Boston Marathon, killing three people and injuring more than 260 others in an incident that law enforcement officials deemed a terrorist attack.

*Our bias meter rating uses data science including sentiment analysis, machine learning and our proprietary algorithm for determining biases in news articles. Bias scores are on a scale of -100% to 100% with higher negative scores being more liberal and higher positive scores being more conservative, and 0% being neutral. The rating is an independent analysis and is not affiliated nor sponsored by the news source or any other organization.