What the hell is the "kill line" when you're in America?

My name is Li Ang. After a hundred years of transmigrating into the cultivation world, I finally returned to "Blue Star" after countless hardships. Finally, I no longer have to endure the treacherous and terrifying life of the cultivation world. However, he discovered that he hadn't transmigrated back to China, but to America. Wait... what the hell is the Demonic Path System? What the hell is the Slaughter Line? Does the system think the entire United States is a massive demonic sect? [Demonic Path System Activated] [In the Land of Dharma Decline, the Demonic Path runs rampant, and the rules have collapsed] [The path of the Demonic Path is paved with mountains of corpses and seas of blood; the strong devour the weak, and the defeated turn to dust—this has been the way since time immemorial.] [Mission Issued: Eliminate the two demonic cultivators before you] [Mission Reward: +1 freely distributable attribute point] Li Ang: "?" Looking at the two black thugs before him, Li Ang was somewhat surprised. Could they really be called demonic cultivators? ...It wasn't until later that he discovered that America was actually a massive demonic sect! Beneath this seemingly glamorous beacon of freedom, countless dangers lurked. This place is teeming with demonic cultivators; darkness has long since enveloped the land. Looking at the death lines above everyone's heads, Li Ang felt that the demonic cultivators of the cultivation world were utterly pathetic. This book is also known as: "A Century-Old Cultivator Returns, Is America Actually the Largest Demonic Sect?" and "Return of Cultivation: Can I See the Death Line?"