Technology in Time

Hi, guys! Today, I'll be going over how I understand the three time periods that we've discussed throughout the semester--Ancient, National, and Modern.
Each time period used different types of materials that resulted in different technologies. In Ancient times, the biggest factor was to have some sort of stable shelter whether they were staying where they were or moving around a lot. This means they started out with pretty much whatever they could use around them such as sticks, leaves, mud, etc. Soon enough, they made it up to using concrete in places like Greece and Rome. Then we move on to National times, and we find that they have already mastered using basic concrete and have started using more bricks. Some buildings have even started incorporating a little bit of metal and glass. This shows that they've moved on from wanting abasic shelter, but want to improve their every day life. Finally, on to Modern times (which we're currently in), we find ourselves in a period of metal and glass. Bricks and concrete have become an almost rare sighting due to the sudden abundance of metal and glass buildings/structures. Not only that, but we now see different technologies coming in that deal with more than just basic living. We're now trying to find ways to improve our life as well as our planet's life, so we've come up with eco-safe advances that include energy saving, minimal water usage, basic recycling, etc.