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Applying for a Visitor Visa
Applicants for visitor visas should
generally apply at the nearest U.S.
Embassy or Consulate in the country
where they live. It is important to apply
for a visa well in advance of the travel
departure date.
Completing Form
DS-160, Online
Nonimmigrant Visa Application,
(ceac.state.gov/genniv/), is the first step in the visa application process. After you have submitted Form DS-160, print the confirmation page and
bring it to your interview. Next, pay the
non-refundable visa application fee, if
you are required to pay it before your
interview. Then, make an appointment
for an interview at the U.S. Embassy or
Consulate where you pay to apply for
your visa.

You should have the following documents available while you complete your DS-160:

Passport
Travel itinerary, if you have already made travel arrangements.
Dates of your last five visits or trips to the United States, if you have previously travelled to the United States. You may also be asked for your international travel history for the past five years.
Résumé or Curriculum Vitae - You may be required to provide information about your current and previous education and work history.
Other Information - Some applicants, depending on the intended purpose of travel, will be asked to provide additional information when completing the DS-160.

Not to mention biometrics requirements:

https://www.cbp.gov/travel/biometrics

There are waivers, but the requirements for that are very similar and usually only benefit frequent travelers or travelers from certain countries.

Even the least requirements will answer the question of who you are, where you are coming from, and what your purpose (stated purpose) of coming here.

There is a criminal background check done in the US and the country you are coming from whether people know that or not it is done.

Remember we know NOTHING WHATSOEVER about those that cross the desert at the border. NOTHING.