Setting 1: A brief history of the RX era of "Iron Earth"

"The sands of time fall slowly. Once they come to an end, God will send angels to turn the hourglass over, and human society will start all over again."

—RX1954, "Our Legend" by Roots Alex

"We used to think that time was linear, but current archaeological excavations have proven that we may be wrong. Time may have an end."

—RX2022, Wang Boxue's "Legendary Archeology"

We always see science fiction works of one kind or another. Human beings leave the earth and enter the universe, developing their own civilization in the galaxy or even the entire universe. We are all accustomed to this.

People on Earth in another dimension don't think so. Their history will always be "ended" by a mysterious force. No matter how advanced technology is, once the "end" begins, humans will have to return to primitive society.

No one remembers what happened, but the memories of previous eras are still revealed to those who come later through legends and underground relics.

From this, people learned that there would be an era in the future where humans would drive robots to fight in the universe, but no one knew what happened after that.

After such "reincarnations" countless times, humans living in the RX era finally entered this era.

…

"A Brief History of the RX Era"

In the 1980s of the RX era, the earth was devastated due to human development. For this reason, some people propose to unite the forces of various countries and establish colonies in the universe to alleviate the environmental and population problems of the earth.

Some even suggested that we should recreate the "Earth".

The former idea is supported by most countries. However, due to geographical issues and other issues, all countries in the world have not unified as a whole. Instead, six different major forces have formed, competing or collaborating with each other.

The plan to build a "New Earth" has not been abandoned. After hundreds of years of efforts by the large consortium Moore Chamber of Commerce, the "New Earth" has turned from a hypothesis into a reality. RX In 2050, the construction of the "New Earth" began. 150 years later, the "New Earth" has been 70% completed, and more and more people are beginning to support this plan.

Putting aside the "New Earth", let's return to the space colonization plan. RX In 2020, the first colonial satellite "Eden" was completed, and then various colonial satellites sprung up in the Earth's circle. There are about 200 colonial satellites in operation now, less than 30% of which are in the hands of the six major forces on the earth, and the rest have become independent "city-states".

Tens of billions of people have left the earth and built their new homes in the universe. But after these people have made the universe their home, they find that the forces that sent them away from the earth have collected more taxes on the residents of the universe in order to save the economic problems caused by the colonization plan. The residents of the universe have to spend more to buy products from the earth. However, the goods they worked hard to produce were imported to the earth at a low price. Later, various forces even deprived the citizens of the universe of some rights.

Therefore, the independence movement of space residents broke out in RX2099, and the colonial satellites demanded independence one after another. After decades of struggle, most of the colonial satellites broke away from the control of the sovereign forces and became independent city-states.

But among these independent colonial satellites, the colonial satellite "Rome" started a war that swept the entire earth circle in RX era 2199...