Every year, the US awards 50,000 diversity visas to applicants from nations who are under represented in US Immigration statistics. Here is a link to the USA Green Card Lottery:
Diversity Visa (DV) Lottery Instructions
The application will probably open in October.
While I doubt that Sweden is under-represented among those immigrating to the US, which would mean the OP might not be eligible, other readers might want to know about the lottery.