Short answers, pulled from the story.
The first full service casino resort on what is currently called the Strip opened with 63 bungalow hotel rooms on the 3rd of April 1941. That property was named El Rancho Vegas and it marked a turning point for the region.
Organized crime figure Bugsy Siegel took an intense interest in the growing Las Vegas gaming center and funded another resort by financing the completion of the Flamingo construction with mob money. The Flamingo casino opened in December 1946 while the hotel portion opened in March 1947.
On the 21st of November 1980 that property suffered the worst resort fire in history killing 87 people due to electrical problems. It reopened eight months later after Kerkorian sold the MGM Grand to Bally Manufacturing in 1986 and it was renamed Bally's.
The Tropicana was demolished in October 2024 after closing on the 2nd of April 2024. It will be replaced with a new Bally's Las Vegas resort and New Las Vegas Stadium which will become home to the Athletics after they relocate from Sacramento.
With the opening of the Bellagio in 1998 the Strip trended towards the luxurious high-end segment through most of the 2000s. Venetian opened in 1999 followed by Wynn in 2005 and Palazzo in 2007 while Encore arrived in 2008 completing a wave of luxury developments.