September 11 2001 is one of those very few collective “flashbulb moments” where pretty much everyone remembers where they were and what they were doing when it happened. This is how the day was for me.
“Sam! There’s been a big crash.”
In their kitchen there was a small 13-inch TV; one of those old TVs which needed about a foot (1/3 meter) of space behind it to fit the CRT tube, and which bulged out about an inch (3 centimeters) in the front. 
On the TV, I saw an image of a plane crashed in to one of the twin towers. I mentioned to my roommates that it must have been an accident with the Blue Angels (an air show). They said that it wasn’t and then I saw on the TV a video of a second plane crashing in to the other twin tower.
I looked at my Mexican roommates and told them “This is an act of war”. Realizing that there was nothing else I could do, after looking at the news for about 15 or 20 minutes at the house, I packed my stuff together and started walking to class—a good 30 minute walk.
By the time I got to school, one of the towers had already fallen. The north tower was still standing, and CNN—which we were able to get in English despite being in Mexico—was showing non-stop news from New York with commentaries on the attack and people talking about the attack, coverage of the attack of the Pentagon, as well as repeatedly playing amateur videos of the second plane hitting the south tower from different angles. 
I was on one of the computers sending via email  my family my impressions of the September 11 attack. While doing this, I heard a shout from my classmates and saw on TV live images of the north tower collapsing. Up until that moment, I had hoped that the north tower would stand and we would be able to repair it.
One of my classmates was from New York. Indeed, her uncle was a firefighter and one of the first responders to the September 11 attacks. He did not survive the towers collapsing. My classmate was not even able to return to New York to go to his funeral—all flights had been canceled for a few days in the wake of the attacks.
Since I was in an extended Spanish learning program, I ended up staying for a couple more months before finally returning to the US. When I left, before September 11th, my family was able to be with me at the departure terminal and watch me board the plane. Indeed, before September 11th, you would meet your family or friends at the arrival terminal unless it was an international arrival. For the first time, when returning from Mexico, I had to get out of the boarding area and go to the airport’s lobby before being able to meet my family.
Even though months had passed before I had returned to the US, there were still patriotic signs and USA flags visible from the freeway as we drove home from the airport; my mother mentioned to me that there were even more right after September 11th.
September 11, 2001 is a day that changed the world.
The picture above, taken by Leo Marihart, shows how I looked a couple of months before 9/11.
 While DVDs did exist, tape-based VCRs were still being widely used. In addition, even though Apple was already making their computers WiFi aware, it would be another year or two before WiFi became really mainstream; I either physically connected my laptop to an ethernet cable to go online, or simply used a desktop computer already connected.
 While still expensive, portable video cameras were widely used. Digital cameras existed, but cost hundreds of dollars and had only around two megapixels of resolution. Cell phones did not have cameras yet. I was still using film cameras to take pictures, but that would change in a couple of years.
 Neither Myspace nor Facebook even existed in 2001. People mainly used email to keep in touch; personal websites were probably more common than they are today.
 This was years before the Mexican drug violence got really bad; it was still relatively safe to take a bus or even drive in Mexico's border cities.
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