Henry Ford published this series of articles in 1920 looking at the role of Jews in the international society of his time, which is to say, after WW1 and pre WW2.
He saw the Jews as a separate group, having maintained their identity over millenia by means of a strong racial awareness, intermarriage laws, religion and tradition. There isn't much to doubt about this, but he moves on to consider how this Jewish group has interacted with the remaining 97% of Gentile society (in 1920 Jews were about 3% of the US population and are a similar proportion today).
He concludes that there are positive and negative effects. On the positive side he shows traditional Jewish commercial activities such as banking becoming centred in the most tolerant countries (in his day and at present the US) providing plentiful Gentile employment which in the modern context would include the media and entertainment industries.
On the negative side is the manipulation of their host legislatures, foreign policy, economy and media channels for their own rather than the national benefit.
Although he doesn't express it in these terms, he is really asking whether Jews and Gentiles have a symbiotic relationship (both sides benefit) or a parasitic relationship (one side benefits) in the countries in which they coexist.
He comes down mostly on the side of a parasitic relationship which he supports by the considerable efforts that Jewish organizations go to to hide their power and shut down any references to it in the media. They label it as anti-Semitic, which it often is, but Ford makes it clear that the Jews themselves have been operating a solid racist policy since at least Roman times so it isn't a surprise that Gentiles sometimes react in the same way.
The book identifies Gentile nationalism and racial identity as a principal Jewish fear, hence their strong support for multiculturalism (for Gentiles) and liberalism (for Gentiles) of the kind promoted in the collapsing late Austro-Hungarian empire and German Weimar republic, both of which they powerfully influenced.
He shows that the the murderous Bolshevik revolutionaries were almost entirely Jewish and the catastrophic result that their revolution had for the Russian and Ukrainian populations, and, should he have written his articles post WW2, he would have added the equally catastrophic German nationalistic reaction against the early 20th century Jewish domination of German society (e.g. in 1912, one out of three high school students in Vienna was a religious Jew, 40% of medical students were Jewish etc. displacing the traditionally German middle class - See Brigitte Hamann )