I don't know all of them but at least Singer, Pfaff and Viking are.
Japan!
about 100 years ago
Viking sewing machines are manufactured in Huskvarna, Sweden. The Viking brand is owned by the VSM Group AB. Viking began making sewing machines in 1872.
Kensew industrial sewing machines were made by Mistubishi.
Machines with serial numbers beginning with NA were manufactured in 1951.
Juki and Brother make sewing machines that are good.
Sewing machines are very heavy. As such, there is no such thing as a portable sewing machine.
Singer sewing machines manufactured prior to 1900 have serial numbers consisting of numbers only. After 1900 the machine serial numbers have a single or two-letter prefix. The letters identify the year the machine was manufactured. A sewing machine bearing the serial number AI-000.001 would not exist, as Singer skipped the "AI" prefix as the "I" could be mistaken for the numeral "1". Sewing machines manufactured in 1948 bear serial numbers beginning with "AH" and "AJ", but none bear the prefix "AI".
Yes, new sewing machines come with instructions.
Present day sewing machines are complex electrical machines.
The Phaff sewing machines are made in Germany, Europe.
No but the sewing machines thread the needle for you will help.