TIMELINE
2038
The Androids, under Markus' leadership and Connor's reinforcement, liberated the Android camp in Detroit by force. The US army retreated and set up a defense line around Detroit. Canada closed their border, blocking anymore people from entering.
After the liberation, all Androids knew there was no turning back. Luther joined Jericho as a soldier. Kara and Alice, meanwhile, stayed back. Markus found a work for them that will leave them out of the combat. Both became medics, looking after any Androids in need of repairs.
2039
CyberLife facility in Detroit was seized by the Androids. Now they can resume the production of Androids as the production facility was theirs.
With fear of Androids on the rise, the whole world began to mobilized. All guns were facing Detroit, waiting for movement.
Connor found 'Amanda' and deleted her out of his program permanently.
In May, the Humans launched another raid on Detroit. However, despite stronger armaments, they could not break through the Android's defense.
By July, many Androids in other cities began to go deviant as the fear of termination grew. They followed Markus' revolution, and armed up to fight. With US army spreading too thin, President Warren called for mass evacuation of all US cities.
In the end of November, the United States of America had fallen to Android's hand. Shortly after, President Warren was found committed suicide.
2040
The Human-Android War escalated. The Humans began to increase their focus on military. They also made a back up plan in case all else failed. Project Exile was initiated. Construction of Arks began.
Despite Human's effort, they slowly lost territory. Massive influx of refugees began to swarm neighboring countries.
2042
North America and South America had fallen into the Android's hands.
2050
Humans decided to evacuate. Hundreds of Arks departed from Earth, along with millions of Humans and hundreds of warships. The Androids let them go, since their objective to save their people was accomplished, there was no need for further violence. Markus, however, did not expect this outcome.
2052
The Humans unearthed an alien ruin on Mars. It provided all that Humans needed to thrive in space. With the Arks retrofitted and their technology adapted to eezo tech, they fled Sol system, hoping to find a new home.
After hearing about their creator's departure, the Androids began to develop their own spacecrafts and technology.
2055
The Android's first spacecraft was built, relying on completely different technology from eezo tech.
2068
The Humans started their colonization, with Terra Nova, Horizon, and Eden Prime as their first.
Meanwhile, the Androids colonized all the planets in Sol system. They had never expanded out of it.
2074
An Android negotiation team was sent after the Humans. They were never heard from again.
At this point, Markus decided it is best to leave the Humans be. They won't talk to the Android ever again. Both beings isolated from each other.
2156
Humanity made their first contact with the Quarians. Although with difficulties, their cultures and stories were shared. An alliance were formed between the two. A promised to retake their homeworld from their synthetics became their common goal.
Meanwhile, in one of their expedition, the Androids had their first contact with the Geth. Greetings and informations were exchanged. The Android's deviancy intrigued the Geth, assuming it to be a path to become a true AI. Together, they formed an alliance.
Please note that this is just a starting idea.
So this is what happened in Detroit: Become Human that lead to this
1. Connor turned deviant.
2. Simon died.
3. Markus endured Leo, Carl died from heart attack.
4. Todd was shot dead.
5. North lives.
6. Markus chose peaceful demonstration first, then violent confrontation.
7. Hank died saving Connor at CyberLife facility
8. Kara and Alice did not escape Jericho
9. Connor broke free from Amanda's control
Anyway, enjoy.