The eyes have it
It borders both
American Inventions
Starts with 3 Consonants
Bodies of Water
100

A student, or a minor in Roman law

Pupil 

100

Brazil & Panama

Columbia 

100

This 1969 invention of Don Wetzel is associated with a P.I.N.

ATM (Automated Teller Machine)

100

This element was discovered in 1774; before then, swimming pools must have been pretty unpleasant

Chlorine 

100

In 700 B.C. Greeks first crossed this sea to colonize Samothrace

Aegean Sea 

200

A blow with a whip

Lash 

200

Tanzania & Ethiopia

Kenya

200

On Feb. 21, 1947 Edwin Land demonstrated one of these to the Optical Society of America

Polaroid/Instant Camera

200

Also meaning the main cause, the "main" one of these is found in clocks

Spring

200

Bahrain is composed of several islands in the Gulf of Bahrain & this larger gulf

Persian Gulf 

300

A hollow area that holds a light bulb

Socket 

300

Norway & China

Russia

300

In the 1960s this U.S. firm released the first word processor, an adaptation of its Selectric typewriter

IBM

300

6-letter word for hasty writing that may be illegible:

Scrawl

300

Indenting the coastline of Alaska, Norton Sound & Kuskokwim Bay are inlets of this sea

Bering Sea 

400

A Flower that fits this category 

Iris 

400

Switzerland & Poland

Germany 

400

Without this 1947 invention of Shockley, Bardeen & Brattain, we'd have 40-pound Walkmans

Transistor 

400

It means to spend money lavishly indulging oneself, perhaps while on a spree

Splurge

400

The Korean Peninsula borders the Yellow Sea to the west & this sea to the east

Sea of Japan 

500

People say these are what you need to make it in Hollywood

Contacts

500

Algeria & Libya

Tunisia

500

Almost 40 years after Otis invented the safety elevator, Jesse Reno developed this people mover

Escalator 
500

The mistle type of this common songbird

The Thrush 

500

Some say the Weddell Sea is an arm of the Antarctic Ocean; others say it's part of this larger ocean

Atlantic Sea